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For the Ceph prometheus exporter (aka mgr/exporter module), the perf-counter names become API contracts, so some integration testing should be performed to ensure metric names (perf-counter names) doesn´t change (inadvertently).

A proposal is to add a new Ceph API test (so run at CI, as well as Teuthology) that:

• Performs a GET /metrics against the Prometheus port
• Compares the output of it to a pre-saved template (pseudo-schema)
• Optionally: it might perform some linting static checking:
  • Proper metric types
  • Metric naming best practices (valid chars [a-zA-Z_:][a-zA-Z0-9_:]*., starts with ceph_*, ends with [_total, _seconds, _bytes, ...])

This will mean that adding/renaming/removing metrics will lead to an error (that properly points to the issue and action to fix it).